Malicious PDF — malware analysis report

Static analysis result for SHA-256 678aaf6cd613099d…

MALICIOUS

PDF

86.9 KB Created: 2021-07-15 12:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e5047f1d75efcfdda8cb3b19a679137 SHA-1: b6ce986a82c9faf466d1fce4f5df2f7887dffa27 SHA-256: 678aaf6cd613099da52101621ef9b563a8017b6fec177347402db4f402cc7753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=natural+gas+smell+outside PDF link annotation
    • http://eltonltd.ru/sites/default/files/uploads/lumazodavoj.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/1470513994.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/85ea05938e9be096379c584847e84489/11095479304.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/87816257628.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c653aa1258---jodawamejovonetimumut.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/kixuzozofudumiremomisube.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e968937102---nixebe.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/noduderamolerodij.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wifilekanaragenijuj.pdfIn PDF document text
    • http://apsons.eu/files/file/zuvadipiwezejutekufevutug.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265b176ef0---vogogujiw.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/79614510947.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sebetiripefunuf.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/daligubunuz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f5b1e6b9---98201915469.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5e735a941c87551e18224fb28d170083/5592452960.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/73676718603.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/71610627909.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6f57be59---68216704680.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e6rdsq2vuh7c48obpsp74tujt5/wuwinuzokijumu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/15828fd9bd785f3eeeb15a7d05f7759d/polofibezimigofisune.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/78966452618.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4c8d46cf---54917939123.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de2095a0a2a---sexurufol.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jgvq1v8s4jjfcpp99r0jcscfmq/71161295483.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 17212 bytes
SHA-256: 38720bdf25dc1939a44c743f647e693438aa8e073e92114f75208e1fbc4cda26
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 10564 bytes
SHA-256: 5fb73bcac2830b35642f1204f10a17f28981673450871ea09d5bd7b9c3c5bdd8

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